package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     *  切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException {
        log.info("开始公共字段自动填充..");

        //获取当前被拦截到的数据类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        //准备当前的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            try{
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime",LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser",Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser",Long.class);

                //通过反射为属性对象赋值
                setCreateUser.invoke(entity,currentId);
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }catch (Exception e){
                e.printStackTrace();
            }

        }else if(operationType == OperationType.UPDATE){
            try{
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime",LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser",Long.class);

                //通过反射为属性对象赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }catch (Exception e){
                e.printStackTrace();
            }

        }

    }
}
